0
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p=-15
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5p + 4y
7p + 2 = 5p + 8 7p - 5p = 8 - 2 2p = 6 p = 3
20 = 4p + 5 +p 20 = 5p + 5 5p = 20 - 5 = 15 5p = 15 p = 15/5 = 3
p=1
==>-3p+7=5-8p+6 ==>5p+7=11 ==>5p=4 ==>p=4/5